Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 6, Issue 1, Pages 195-199Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b712885a
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Four stable carbenes, 1-tert-butyl-3,4-diaryl-1,2,4-triazol-5-ylidenes 1a-d, including new fluorine-containing compounds 1c,d, react with a malonic ester to afford heterocyclic zwitterionic compounds 5a-d. The reactions with more acidic compounds ( ethyl acetoacetate, malononitrile and 1,3-dimethylbarbituric acid) proceed with substrate deprotonation to form the respective azolium salts 6a-c. The X-ray crystal structure of 5a was also determined.
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